title: Effect of β-cyclodextrin on intra and intermolecular Michael addition of some catechol derivatives.
abstract: The oxidation reactions of catechol, dopamine and epinephrine have been studied in the absence and presence of N-methylaniline by UV-Vis. Spectrophotometry. A variety of reaction pathways (inter and intramolecular reactions) that followed by this oxidation have been observed depending on the nature of catechol derivatives. The observed homogeneous rate constants of the reactions were estimated by fitting the absorption time profiles for each reaction. The effect of β-cyclodextrin and its inclusion complex has also been studied on the chosen reactions. The formation constants of the complexes of catechol, dopamine and epinephrine with β-cyclodextrin as well as the rate constants of the reactions of free and complexed forms have been obtained by fitting the absorption-time spectra to a proposed kinetic-equilibrium model.
authors.affiliation: Department of Chemistry, Shahr-e-Qods Branch, Islamic Azad University, Tehran, Iran. Electronic address: l_khalafi@yahoo.com.
authors.forename: Lida
authors.initials: L
authors.lastname: Khalafi
authors.forename: Mohammad
authors.initials: M
authors.lastname: Rafiee
authors.forename: Sahar
authors.initials: S
authors.lastname: Fathi
mesh_terms: D000814:Aniline Compounds / Q000737:chemistry*; D002395:Catecholamines / Q000737:chemistry*; D002396:Catechols / Q000737:chemistry*; D010084:Oxidation-Reduction; D047392:beta-Cyclodextrins / Q000737:chemistry*
chemical_list: D000814:Aniline Compounds; D002395:Catecholamines; D002396:Catechols; D047392:beta-Cyclodextrins; C031215:betadex; C034221:catechol; C021313:methylaniline
keywords: Catechol; Catecholamine; Inclusion complex; N-methylaniline; Oxidation